Australian postcodes are helpful in the address verification and standardization process. Postal companies can process mailers more accurately to save costs. Each postcode represents a specific locality or neighborhood with a unique geographic identifier. 

They help in assembling and routing mail items across the Australia Post system. These postcodes are necessary to presort mail for efficient deliveries and higher customer satisfaction. The data from the postcode helps you ship your official and marketing mail accurately and efficiently. Many businesses use postcodes in fraud prevention for online transactions. A clean postcode database ensures higher operational efficiency for a business by eliminating poor data. 

Using proper postcodes in Australia also reduces return mail for a business. They don’t have to handle backlogs by simply delivering to the correct recipient in the first place. Delivering mail and packages to their receptive destinations on time means better customer satisfaction and retention levels. However, there are many more use cases of postcodes that this blog will walk you through. Also, we will talk about the significance of address validation for companies.

What are the Postcodes In Australia?

Australian postcodes are a string of four numbers that represent specific localities or neighbourhoods. It is a unique geographic identifier and offers high-quality demographic information.

Businesses use Aussie postal code lists for fraud prevention, shipping, information coordination, etc.

Primarily, they help assemble and route mail items within the Australia Post system. Mention them at the end of mailing addresses after writing the state abbreviations.

In 1967, the Postmaster-General’s Department introduced postcodes in Australia, and the entire system is under postal management. You can avail of the whole list of postcodes from the Post Office in the form of booklets. Alternatively, you can order online from Australia Post’s website if you want to store them in digital format.

Often, postcards and envelopes have four square boxes in orange to mention the postcode. They enable postal workers to sort mail pieces automatically, helping them speed up the delivery process.

History of Postcodes In Australia

The purpose of the introduction of postcodes was to replace the older postal sorting structure, like Melbourne’s numbering system. (e.g., E5, N8) Also, there was a similar organisation in New South Wales’ regional and rural parts.

The introduction of large-volume mechanical mail sorting also took place around the same time as the commencement of the postcode Australia system.

75% of mail items were using postcodes by 1968. The Post Office introduced postal preferred-size envelopes or standard envelopes the same year.

The orange-coloured postcode squares came into existence in June 1990 to help the postal services employ Optical Character Recognition (OCR). It assists Australia Post in sorting mail by postcodes more quickly.

Postcodes in Australia are assigned to different geographic areas, helping Australia Post process and deliver mail to the intended recipients. The current 4-digit numeric postcode system was introduced on July 1, 1967, along with the nation’s first mechanised mail processing centre.  This new system was developed for electronic mail handling equipment at the former Redfern Mail Exchange in Sydney.

Now that you know what is a postal code is, let us discuss its functioning in depth. Australian postcodes consist of sorting data, and the Post Office uses them to group mail pieces going to similar locations.

Population

Often, postcodes represent only one geographic area. For instance, 6160 covers the city of Fremantle only. However, it gets complicated because of the postcodes that belong to numerous towns, like 2570. The postal code 2570 includes 22 suburbs and cities around Camden.

Also, postcode 3221 in Victoria, which belongs to the Geelong Mail Centre, includes twenty places with a low population. It indicates that Australia Post does the mail sorting after it reaches Geelong.

Other postcodes include larger populations (e.g., 4350 serving nearly 100,000 addresses in and around Toowoomba). But, there are also many postcodes in Australia covering urban areas with a small population. Hence, there is no general rule regarding how many places a postcode should cover.

Towns Having Two Postcodes

The postcodes start from 0200, serving the Australian National University, and range up to 9944, covering Cannonvale in Queensland.

Plus, several suburbs and towns have two postcodes—one for PO boxes and the other for door-to-door deliveries. For instance, PO box 99 in Parramatta comes under postcode 2124. However, the same area also has another postal code- 2150 for street delivery.

Large Volume Receivers

Many large government departments, companies, and other crucial institutions that receive bulk mail have their Aussie postal code. These organisations are known as Large Volume Receivers (LVRs).

Here are some examples:

0200- Australian National University.

4029- The Royal Brisbane and Women’s Hospital, etc.

However, the Post Office has been discontinuing the LVR system since 2006.

Postcodes of Australia Covering More Than One State

Postcode 2620 includes an area in the Australian Capital Territory (Hume) and a locality in New South Wales (Gundaroo). Also, postcode 0872 serves several localities across Western Australia, Southern Australia, and the Northern Territory.

So, it is common for some postcodes to cover places in different states, even if it complicates the routing process.

We hope you now know what is postcode in Australia so far and how they work. Now, we will move on to the allocation of Australian postcodes.

The first two postcode numbers indicate the state or territory, while the other two help locate the address. Here are the postcode ranges of the different states and territories:

There are several applications of postcodes, certainly more than we know. They form a significant component of several crucial operations for companies, like

Insurance

Often, insurance agencies use postal code data to determine the premium rates of a house or car. There are considerable variations in the costs, depending on the locality or city. Thus, knowing the postcodes for quoting prices is ordinary.

Also, insurance agents use this data at the time of settling claims. Hence, postcodes are an integral aspect of their day-to-day work.

Transport

The transport system in New South Wales employs postcodes of Australia to allocate specific numbers to bus stops. Usually, the stop numbers consist of five to seven digits—the first four comprise the postcodes, and the remaining represent the stop number.

Metropolitan Street Maps

These maps have all the Australian postcodes grouped according to the suburbs. They help define sales strategies and choose franchise locations.

The companies that manufacture these maps use postal code lists regularly. They enable businesses to have a spatial representation of their target localities.

Federal and State Government Institutions

These organisations publish several statistics now and then by postcode. Hence, there are several social planning-related activities that postcodes help accomplish.

However, there is an issue with the spatial representation of the postcodes in Australia. The postal services add and remove postcodes all the time for operational purposes, which causes deviations in several plans.

Presort Mail

It is one of the most crucial use cases of postcodes. Most companies use automated direct mail solutions like PostGrid that help validate their mailing lists and presort their items according to the postcodes in Australia.

Shipping and Logistics

It doesn’t matter if you send a transactional mail item to a client in Sydney or conduct a direct mail campaign covering several cities. Postcode data can help you ship your official and marketing mail efficiently and accurately.

Identity Verification

The postcodes of Australia also help in fraud prevention for online transactions. They aid the identity verification programs that help companies avoid data breaches and fraud.

Ecommerce 

Online shopping sites need accurate Australian postcodes to determine shipping costs, estimate delivery times, and validate billing addresses to reduce fraudulent transactions. These postcodes also help in their location intelligence efforts, optimize inventory management, and delivery operations in the country. They also match the billing addresses with the cardholder information to reduce the chances of unauthorized online transactions. 

Marketing Campaigns

Many businesses rely on postcodes to segment and target their audience based on their geographic location. They often use these codes in their digital and direct mail campaigns to perfectly time ads depending on the correct timezone. Postcode data could also help direct calls to the appropriate sales representatives with more relevant information. 

Healthcare 

Many healthcare companies rely on postcode data to understand the social determinants of health in a particular area. This data can give insights into social, economic, and environmental factors that may impact health outcomes. Providers often use location intelligence to spot gaps in their services and improve accessibility to primary care, specialists, and mental health services. 

Regulatory Compliance

Specific industries, like finance and healthcare, have strict regulatory requirements for obtaining accurate user information. Postcode data is helpful to ensure compliance with these regulations. Compliances like HIPAA, GDPR, or CCPA require organizations to collect and retain only the personal data necessary for a specific purpose.  

How to Find a Postcode? 

To avoid delivery delays, every mailer or package you send must have a correct postcode. Australia Post provides a postcode finder tool to search and check postcodes across every suburb and location. Use the search box to enter the suburb, town, city, or postcode to find the accurate code for a geographic region. The postal service also provides a downloadable postcode data file for non-commercial and commercial purposes.

Structure and Significance of Each Digit in Australian Postcodes 

Australian postcodes have four digits; you need to write them after mentioning the name of the city, suburb, or town on an address label. Here’s how you write a typical Australian address; 

Recipient’s Name 

12 Queen Street 

Melbourne VIC 3000 

The first two digits often represent the state or territory where the postcode is used—the Australian Capital Territory (ACT) is an exception to this rule. The second indicates a specific region within the state, assisting postal workers in finding the delivery area. Locality or delivery point information can be found in the third and fourth digits of the postcode. A postcode is the third and final component of the address line. 

How Are Street Addresses Different From P.O. Box Addresses? 

Australia Post makes regular deliveries to street addresses and P.O. Boxes nationwide. The main difference between the two is that the post office sends mail to a postal location if you use a P.O. box address and a physical location if you have a street address. 

A P.O. box address adds security to your real residence or office address. Businesses can send various direct mail materials to these boxes without requiring recipients to provide their addresses. However, the recipients cannot use their P.O. box address as their street address because it doesn’t fulfill the requirements of a physical address. 

P.O. addresses also don’t have an apartment or house number like street addresses. A street address usually states the place where you reside. The formats are also very different. Here’s how; 

Street Address 

John Carter 

123 George Street 

Sydney NSW 2000

AUSTRALIA 

P.O. Box Address 

John Carter 

P.O. Box 789

Brisbane QLD 4000 

AUSTRALIA 

Mistakes to Avoid When Writing Australian Postcodes 

1. Invalid Format 

Sometimes users forget that Australian postcodes have four digits and tend to add additional numbers, letters, or symbols. It might immediately make the code invalid and lead to delivery delays. You should always use the correct format while writing an Australian address. 

2. Missing State Abbreviation

Australian addresses always have the appropriate state abbreviation on the third line, before the postcode. Each state and territory has a particular two- or three-digit abbreviation that you must add to the address label to help the postal workers in the sorting process. Forgetting this element might lead to misrouting or even significant delays. 

3. Use of Unnecessary Punctuation 

An Australian address with a postcode doesn’t require any unnecessary punctuation for formatting. Your postcode will immediately become invalid if you add commas or full stops to the third address line. 

4. Poor Handwriting or Illegible Font 

Ink blotting or smudges can easily make the address line unreadable. Postal workers must be able to see the numbers in the postcode to facilitate the sorting process. Always try to use dark ink to write or print the address details on the labels. 

5. Incorrect Postcode for a Specific Locality

Each Australian postcode corresponds to a specific area. A few postcodes cover multiple towns or suburbs. There’s a chance that you could be using an incorrect postcode for your recipient’s address. Use Australia Post’s postal code finder tool if unsure about the correct postcode. 

What Are Postcode Squares? 

Australia Post prefers envelopes with four boxes in the bottom right corner. These boxes and squares have designated space for postcodes. It helps the postal service to use Optical Character Recognition software to sort mailings automatically and embed routing information. This technology was introduced in June 1990 to ease the workload for postal workers and fast-track the postal system. 

The Treaty of Bern in 1874 dictated the Universal Postal Union’s launch to enhance global mail exchange. There are hundreds of member countries, and their postcodes are available publicly.

The UPU conducts several seminars, publishes research papers, and creates solutions to promote global eCommerce. You can access their website and search for all the postcodes in Australia. Below are some details of the most popular postcode systems in the world:

ZIP Codes (USA)

At PostGrid, we get many questions, like what is a ZIP code. This term may confuse people, but it is the same as postcode. Undoubtedly, the ZIP codes of the USA constitute a well-curated postal code system under the jurisdiction of the USPS.

So, what is the ZIP postal code?

ZIP stands for Zoning Improvement Plan and has several functions, including mail routing, data verification, etc. The primary objective of introducing ZIP codes was to simplify transport across the country.

Robert A. Moon, a postal service employee, created the ZIP code system decades ago to enhance mail delivery. It works the same way as the postcodes in Australia, with a few minor differences.

Typically, a ZIP postal code is five digits long. But, it is advisable to add the extra four digits that speed up mail sorting and delivery. Nowadays, you can use Intelligent Mail Barcodes (IMBs) that have encoded ZIP codes to automate most of the process. It helps you bag additional postal discounts from Australia Post.

The first digit of the ZIP code stands for a group of US states, while the second and third digits represent a Post Office or sectional centre. Then, the last two numbers stand for the delivery area.

Postal Codes (Canada)

Canada got its first postal code structure in Toronto in 1925. Later on, the Post Office divided the city into 14 delivery zones. The postal areas in Ottawa, Quebec, Vancouver, and Winnipeg also started using this system in a few years.

After knowing what is a postcode and a ZIP code are, you may think that Canadian postal codes are also numeric. But they are alphanumeric, consisting of six digits. Some of the examples include M4K 1M8, T0A 0A0, M1E 1PS, etc.

Canadian codes use the A1A 1A1 format, wherein the first character is always a letter. The starting three digits state the Forward Sortation Area (FSA), and the remaining three represent Local Delivery Units (LDUs).

You can use an address verification API like PostGrid if you have difficulty finding and verifying postcodes in Australia and abroad. It helps you access validated mailing lists that you can employ for many reasons.

Address validation is the key to getting accurate postcodes and sending mail to deliverable addresses. It helps companies benefit from the use cases of the postcodes of Australia effectively.

Autocomplete

PostGrid’s autocomplete API allows your customers to autofill their delivery address and postal code. Hence, it takes them half the time they need to type the full address. Also, it ensures that the entered information is correct and valid.

You can integrate this API into your shopping app or website and boost its user experience (UX). Also, PostGrid offers address autocomplete with its validation services to help you send mail to the correct addresses.

It is also helpful in adding the missing postcodes of Australia to your mailing lists. Thus, you can update your old databases and put them to good use.

Standardise

As said earlier, following the standard Australia Post address format is crucial. Therefore, companies must mention properly-standardised addresses on their envelopes, packages, and other mail pieces.

PostGrid’s address verification API helps standardise your mailing information and postal code lists. It first parses the addresses to separate the components and employs fuzzy matching. Then, it reformats them to make them mail-ready. Hence, you can guarantee accurate and fast deliveries.

Validate

AMAS stands for Address Matching Approval System and is a certification program for address verification vendors. PostGrid is AMAS-certified and cross-checks your postal code lists against the Australia Post database.

Hence, you can rest assured that we return high-quality data that enhances your overall mailing experience.

 Also Read: Copy link
How to Address An Envelope AU

There is more than one advantage of double-checking postcodes beforehand, including

Save Money

You can cut costs considerably by sending mail to the correct postcodes the first time itself. Reshipping, lost mail, returns, etc., can drain your budget and create inefficiencies. But, address verification for the postcodes of Australia can help you prevent such problems and mail accurately.

Also, address verification services like PostGrid help you presort your items by postcodes, allowing you to further lower costs.

Increase Operational Efficiency

It may be a routine for you to pack and mail orders. However, one incorrect postal code can lead to several issues and slowdowns. Hence, you should be prepared by validating your postcodes and maintaining a clean database.

Make Faster Decisions

Having access to an up-to-date postcode list enables you to make prompt decisions.

For example, you can use the postcodes of Australia to target the right neighbourhood if you want to promote your upcoming season sale. Hence, all marketing and planning activities involve the usage of postcodes.

Reduce Mail Returns

Mail returns can increase your workload and lead to wastage. Also, it creates backlogs as you need to reship the old orders again and divert your effort from the new ones.

But, you can skip these scenarios by using PostGrid’s address verification solutions to verify the postcodes of Australia.

Increase Customer Satisfaction

Validating postcodes in Australia and mailing items to the correct delivery addresses can help your mail items arrive at their destinations on time. This practice helps raise customer satisfaction and retention levels.

 Also Read: How To Effectively Use An Advanced Postcode Finder

After knowing about the UK ZIP code and postcode, your next step is finding a reliable address verification service. Luckily, we already have a solution to your needs and guarantee positive results. Our 99.99% deliverability rate is a sign of our efficient address validation capabilities. 

Here are some of the best features of our services:

• Geocoding: The Geocoding feature helps capture the correct mailing addresses of your customers. Hence, if they provide incorrect details, you have the resources to identify the correct address and modify it accordingly
• Fuzzy matching: It is a significant feature of verifying the postcodes of Australia because there could be some minor mistakes. People tend to make errors, like swapping letters and numbers. Hence, PostGrid performs a fuzzy matching check to validate your addresses better
• Bulk address verification: You can upload your existing mailing lists on our dashboard or integrate our API into your system. Either way, you can verify any number of postal codes, as our services are scalable
• International address verification: International postcodes might be hard to find for you. But, you need not worry anymore because PostGrid can validate addresses of 245+ countries. Thus, you can mail to any part of the world and still not worry about incorrect postcodes in Australia

Almost every country has a postcode system known by different names. In the US, there are ZIP codes, whereas Canada has a postal code system. They help the Post Office identify locations more closely and deliver your packages at the earliest.

We hope you got the answers to queries, like how many postcodes are in Australia and what they mean. If you need help, you can use PostGrid’s address verification API that verifies every component of your addresses and makes them deliverable.

Also, our industry-best pricing plans make the whole process much more affordable and efficient for your company.

You can sign up here to learn more about how PostGrid helps you validate the postcodes of Australia within seconds!